Abstract
A fracture mechanics (FM) based investigation on the effects of curved surfaces on fatigue lives of mooring chain links tensioned over curved surfaces is conducted in this paper. Three typical curved surfaces including ungrooved surface, shallow grooved surface, and deep grooved surface are investigated. The mooring chain links tensioned over an ungrooved surface are considered under the combined action of in-plane bending (IPB), out-of-plane bending (OPB), torque, and tension. The chain links supported by the bottom of a shallow groove surface are assumed to be influenced by extra IPB. The chain links laying on the upper surface of a deep grooved surface are considered to be subjected to OPB. The results show that fatigue lives of mooring chain links tensioned over the three curved surfaces are significantly shorter than those of mooring chain links subjected to pure tension. Fatigue lives of mooring chain links tensioned over the three curved surfaces would decrease with the decrease of the diameter of the curved surface. For mooring chain links tensioned over an ungrooved surface, the fatigue lives of mooring chain links would decrease with the increase of the angle between the transverse axis of mooring chain link and the surface.
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